Noiseless strainer.



W. C. NASH. NOISELESS STRAINER. APPLICATION FILED JULY 12. 1916.

1,200,127. v Patented 00%. 3,1916.

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2/ 3f Z0 X INVENTOR ATTORNEY To all whom it may concern:

- WI IAM dNASH, or MEn sHA, WISCONSIN.

noIsELEss s'raAinEn.

Specification of Letters Patent.

Patented Oct. 3, 1916.

Application filed July 12 1916. Serial K0. 108,876.

as used in the manufacture of pulp and like materials for use in making paper and other manufactured products, which strainers are known to those skilled in the art as pulp screens.

An object of my invention is to provide means by which a pulsating circulating impulse is given to the water or other liquid havlng the fiber in suspension so that this fiber will be broken up to give a more pulpy and homogeneousconsistency to the entire mass, and to so constructthis impulse giving means that the screen of the strainer will be cleaned and any large particles which may lodge thereon will. be thrown back into the semi-liquid or liquid mass to be further beaten and separated by the pulmeans by which sa-i ing movement until the particles of the comminuted material making up the pulp are all sufficiently, finally divided and separated that they will pass through the screen.

A further'object is to so construct the the pulsating movement is given that the vibration of the diaphragm or other means by which the pulsatingimpulses are given to the liquid body is actuated by the use of compressed air or other fluid pressure and thus permits regulation of the pressure thereby allowing adjustment and variations in the action for particular masses of material being treated and insuring a cleaner sheet of paper or a cleaner manufactured, product and less accumulation of lumps.

A still further object lies in providing a fluid actuated operating means Which is capable of working to attain a relatively great number of impulses in a short period, and which is economical in its use of fluid as a minimum quantity of fluid is required for each impulse.

With the above and other objects in view, my invention consists in certain novel features of construction and combinations of parts which will be hereinafter set forth in bottom constitutes the cross bars which are bars twhich provide the separate connection with the drawings and then more partlcularly pointed out in the claims.

' orms-E. f

In the drawings:Figure 1 is a View in elevatlon of a strainer with my invention i applied thereto and with parts shown in section to more clearly illustrate the co-. operating elements. a Fig. 2 is an enlarged detail sectional view showing the fluid actuated means. Fig. 3 is a transverse sectional view taken on the line 3-3 of Fig. 2.

The chamber 1 is provided to receive the pulp which is connected with a proper proportion of liquid, and this chamber has a false bottom which is made in the form of perforated plates 2, these plates constituting the strainer section and being either perforated with a plurality of fine openings or provided with relatively "narrow. slits or slotted openingstherethrough. The screen sections or the perforated'plates 2 are preferably made so that they can .be fitted in a relation that a plurality ofthevarious plates will form the completed" bottom for the chamber 1', .the cross bars being provided to support'these plates 2, and as certain o the cross bars more particularly-designated by the reference character 4 are extended to have bearing a ainst the-bottom'portio'n 5 of the 'main struc me, a plurality separate receiving chambers-"are provided beneath the first mentioned chamber and below the plates.

. The bottom portion 5 is supportedon suitable legs or standards 6 and 7 so that it is disposed substantially horizontally, and this spaced apart to leave openings 8 therebetween. The depressed outlet passages 9 are formed in the portion 5 adjacent to the cross receiving chambers 10 one from the other. The dia phragms 11, which are of sheet rubber or other suitable material are secured across the openings 8 and on the upper side of the bottom portion 5 so that they provide clo-'100 sures for the bottoms of the separate receiving chambers 10. A hollow-shaft 12 is connected across between'the standards 6 and 7 to be thus disposed longitudinally of the machine'and is positioned preferably ecu-" -trally beneath the openings 8, a belt pulley 13 being connected on this hollow shaft 12 to permit the application of power to 1311111,. the same. A. compressed air pipe or fluid supply pipe 14 is led from anysuitable source of supply of fluid under pressure and is connected to a stufiing box 15 with the hollow shaft 12, a valve 16 beingprovided to control the pipe 14.

()perating rods or stems 17- are connected through suitable bearing members 18 to be capable of reciprocatory movement and at their upper ends have the head portions 19 shaped to have a reasonably snug fit in the openings 8 andto present a broad flat surface against the under side of the flexible diaphragm 11, one of these operating rods or stems being mounted beneath each of the diaphragms. Bearing casings 20 are mounted at spaced apart points around the hollowshaft 12 and are provided with side extensions 21 having the fluid passages 22 therethrough fromthe bearing openings. A cylinder casing 23 is mounted around this extension 21 of each of the bearing casings 20 and the extension has a-snug 'sliding fit with the cylinder so that it acts as a piston. The upper end of the cylinder 23 is bored centrally and this bore ismadesuficiently large that the rod or stem 17 of the adjacent diaphragm pulsating structure is received at its lower end in this bore, the adjusting nut 24 being provided on the screw threaded lower end of each of the stems to permit adjustment of the operating rods or stems 17 and to consequently vary the relative setting of the head 19, the set nut 25 being received on the screw threaded end of the rods 17 to tighten down agalnst the adjusting nut 24 and to thus hold the adjustment.

he slide bearing rods 26 and 27 are secured on the bearing casing 20-on each side of the extension 21 and at their upper ends are screw threaded. The cylinder 23 is provided on opposite sides with the ears or lugs 28 and 29, and-these lugs are bored through to provide bearing openings to be loosely fitted on the slide bearing rods 26 and 27, coil springs 30 and 31 being mounted around the bearing rodsi26 and 27 above these bearing cars 28 and 29 and the adjusting nuts 32 are provided on the screw threaded end of the bearing rods 26 and 27 to permit" adjustment of the tension of the springs 30 and 31, lock nuts 33 being provided to tighten against these adjusting nuts 32 and to thus hold the same against displacement due to the constant vibratory or pulsating'movement which is imparted to the parts as will be hereinafter set forth.

With the parts arranged as is above set forth, the springs 30 and 31 of each set of diaphragm actuating parts will normally act to exert tension against the cars 28 and- 29 to bring the corresponding cylinder 23 down to a point that the inner end of the bore there,

of rests against the head end of'the extension 21 of the corresponding bearing casing 20, and thus the corresponding diaphragm 11 passageof fluid through this will be brought to the relation shown at the extreme right hand in Fig. 1 where it is substantially level with the lower portion 5 of the separate receiving chambers 10. 1t isadvisable that this represent one extreme position, and of course adjustment ean be made through the nuts 24 and 25 to permit the attainment of a fine regulation to accomplish the proper positioning of the dia-' phragm, Packing rings 34 and 35 are, mounted around the shaft" 12 adjacent to each end of each of the bearing casings- 20 the shaft 12 turned. The groove 37 is formed in the'outer wall of the shaft 12 adjacent to each of the ports 36 and these grooves are extended for a suflicient distance along the longitudinal extentof the shaft 12 that they open out at each end beyond the rings 34 and35.

In the use of the device, the pulp together I i with the liquid will be placed in the chamber 1 by being slid through the pipe 38,or from anyother suitable source, and the main body of the pulp will be held against passage through the screen plates 2 due to .the fineness of the mesh of the same; Now as the valvel6 is opened and fluid is supplied under pressure to the hollow shaft 12 and turning movement is transmitted to the same, the ports 36 will come into registry with the passage 22 and consequently as each ofthese ports reg ers with the corresponding passage, flum under pressure will be supplied to the res ective cylinders and to the op-' erating rods or stems 17 connected with the" cylinders 23. The heads 19 will be raised to distend the diaphragms 11 upwardly. As the shaft 12 continues in its rotation, the passage 22 will register with the next adj acent groove 37 and consequently the fluid under pressure within the cylinder will be permitted to escape back through the pas sage 22 and through the groove 37 to exhaust into the atmosphere and the cylinder 23 will be again returned to the position of inaction through the medium of the springs 30 and 31. By positioning several ports around through the wall of the hollow shaft, a multiplicity of pulsating impulses will be imparted toeach of the diaphragms upon each complete revolution of the shaft 12. It is preferable that four, six, or more or less of the separate receiving chambers 10 be prbvided, and under these circumstances it will of course be understood that a corresponding number of bearing casings 20 together with the connected parts will be mounted as part of the completed machine. As the pulp together with the liquid is contained in the chamber 1 and in the separate 5 receiving chambers 10,,this pulsating movement of the diaphragmsll will cause alternate suction downwardly through and pressure upwardly in the separate receiving chambers and consequently through the screen plates 2, and thus the pulp fiberwill be broken up and any lumps which may exist in the mass, and only those particles whichare sufliciently small to pass the mesh of the screen plate will find their way into the separate receiving chambers 10 to subsequently pass therefrom through the depressed or sunken outlet passages 5. It is preferable that the parts be operated so that the diaphragms 11-W1ll have approximately 440 impulses to the minute, and as a number of fluid supply ports are formed from the hollow shaft 12 in conjunction with each of the diaphragm vibrating means,- it will of course be understood that the shaft need not 4 run at a number of R. P; M. corresponding to the number of impulses desired but rather this can be of course mathematically calcu- Y D ving grooves and ports therein, a bearlng -casing mounted around the grooved and ported portion of the shaft and having. an

lated for the number of impulses given 'above or for any greater or lesser number, By 80 varying the compression of the springs ,and 31, the tension exerted by the same against the ears 28 and 29 of the cylinder 23 I can be varied to give quicker or 'slower return movement and in the same way by in- 85 creasing and decreasing the fluid pressure, .the working strokes of the cylinders may be made-sharper or more sluggish to suit various operating positions. Where a multiplicity of vibrating devices are fitted in con- 4 junction with a single hollow shaft, it is preferable that the fluid supply ports of the various sets be staggered throughout the length of the shaft and thus all of the working impulses will not come at the same time and in this way theload upon the shaft will be equalized and distributed throughout the complete revolution thereof.

From the foregoing it will be seen that I have provided an operating structure by which a pulsating or vibratory movement is imparted, which structure is perhaps particularly well adapted for use in connection with a strainer such as is used for pulp screening and in other connections in paper 5 making, and thus the device is so constructed that the outstroke, is cushioned by the springs 30 and 31 while the return stroke- 4 under the tension of these springs is cushioned by the escaping air in the cylinder, 59 and further it will bea'apparent that a device is provided which is at once very simple and eflicient in its operation but at the same time is economical in its use of the com- I pressed fluid. Further it will be noted that with such a structure as this there is not the necessity for the use of cams or other mechanical operatlng means in consequence of which there is not the objectionable bump-' ing followin g each rising stroke, the use of 011 1s minlmlzed, the wear upon the parts is only such as will come to any turning or reciprocating part, and at the. same time a more efficient operation is obtained and adjustment may be made to suit various op-,

erating conditions and to adapt the machine with which the actuating means is conwith greater efliciency upon various conditions of material.

While I have herein shown and described only one specific form of "the structure, it

scope of my invention and hence I do not wish to, be limited. to the exact disclosure but only to such points as may be set forth in the claims.

I claim:

structed so that the machine will operate 1. A revolubly mounted hollow shaft havextension provided from one side thereof with a passage through the extension, and

a cylinder mounted in a sliding fit over the extension, the parts 'being so arranged that upon turnin of the shaft an expansive fluid is supplied t rough the ports and the passage to the cylinder and is permitted to escape therefrom through the grooves.

2. A revolubly mounted hollow shaft having grooves and ports therein, a bearing casing mounted around the grooved and ported portion of the shaft and having an extension provided from one side thereof with a passage through the extension, a cylinder mounted in a sliding fit over the extension, the parts being so arranged that upon turning of the shaft an expansive flu1d is supplied through the ports and the passage to the cylinder and is permitted to escape therefrom through the grooves, and means to yieldingly oppose the movement of the cylinder under the action of the expansive fluid supplied thereto and to return the same as the fluid is permitted to exhaust through the grooves.

33. A revolubly mounted hollow shaft having grooves and ports therein, a bearing casing mounted around the grobved and ported portion of the shaft and provided with an extension from one side having a passage therethrough, a cylinder mounted in a sliding fit over the extension, the parts being so arranged that upon turning of the shaft an expansive fluid is supplied through the ports and the passage to the cylinder to cause extension of the same along the length of the casingextension and is permitted to exhaust from the cylinder through the grooves, guide rods extended from the-casing in line with the extension thereof, portions extended from said cylinder to be received around the guide rods in a sliding fit, springs mounted on the guide rods to bear against the portions of the cylinder, and means by which the tension of the spring may be adjusted to regulate the forceexerted by the same in opposing expansion movement of the cylinder and in returning the same when the fluid is exhausted through the grooves.

4. In a strainer, the combination with a chamber having a horizontal perforated plate disposed as the bottom thereof toprovide receiving chambers beneath the plate, flexible diaphragms forming the bottom of said receiving chambers,'operating rods having-heads thereon mounted to be capable of movement 7 to vibrate said diaphragms, a hollow shaft having grooves and ports therein revolubly mounted below said op-' erating rod, a .bearing casing mounted around the grooved and ported portion of the shaft in line with each of said rods, an extension provided from each of the casings and having a passage therethrough, and a cylinder connected on the end of each of the operating rods and mounted in a sliding fit over the extensionof the adj acent bearing casing, the parts beingso arranged that upon turning of the shaft an expansive fluid is suppliedthrough the ports and the passages to the cylinders and is permitted to exhaust therefrom through the grooves thus giving the desired reciprocatory movement to the operating rod.

5. In -a strainer, the combination with a chamber having a horizontal perforated plate disposed as the bottom thereof .to provide receiving chambers beneath the plate,

flexible diaphragms forming the bottom of said receiving chambers, operating rods having heads thereon mounted to be capable of movement to vibrate said diaphragms, a hollow shaft having grooves and ports therein revolubly mounted'below'said operatinglrod,

a bearing casing mounted around the grooved and ported portion of the shaft in line with each of said rods, an extension provided from eachof the casings and having a passage therethrough, a cylinder connected on the end of each of the operating rods and mounted ina sliding fit over the extension of the adjacent bearing casing, the parts being so arranged-that upon turning of the shaft an expansive fluid is supplied through the ports and the passages to-the cylinders and is permitted to exhaust therefrom through the grooves thus giving the desired reciprocatory movement to the operating rod, and means carried by the bearing casing ar-, ranged to resiliently oppose the extension movement of the cylinders and to return the same upon the exhaust of the expansive fluid through the grooves.

6. In a strainer, the combination with a chamber having a horizontal perforated plate disposed as the bottom thereof to provide receiving chambers beneath the plate,

- flexible diaphragms forming'the bottom of said receiving chambers, operating rods having'heads thereon mounted to be capable of movement tovibrate said diaphragms, a hollow shaft having-g ooves and ports therein revolubly mounted below said operating rod,

a bearing casing Lmounted around the grooved and ported portion of the shaft in line with each of said rods, an extension provided from each of the casings and having a passage therethrough, a cylinderconnected on the end of each'of the operating rods and mounted in'a sliding fit over the extension of the adjacent bearing casing, the parts he guide rods to bear against the extension portions of the cylinder, and means connected on the guide rods to adjust the tension of said springs and to consequently vary the force exerted thereby against the portions of the cylinder.

7. In a strainer, the combination with a chamber having a horizontal perforated plate disposed as the bottom thereof to provide receiving chambers beneath the plate, flexible diaphragms forming the bottom of said receiving'chambers, operating rods hav'- ing heads thereon mounted to be capable of movement to vibrate said diaphragms, a hollow shaft having groovesand ports therein revolubly mounted below said operatin rod, a bearing casing mounted aroun the grooved and ported portion of the shaft in line with each of said rods, an extension provided from each of the casings and having a passage therethrough, a cylinder connected on the end of each of the operating rods and mounted in a sliding fit over theextension of the adjacent bearing casing, the

erating rod, guiderods extended from said bearing casings on each side of the -extensions thereof, portions extended from the cylinders to be received "in a sliding fit around each of the guide rods, springs mounted around the guide rods to bear against the extension portions of the cylinder, means connected on the guide rods to adjust the tension of said springs and to consequently vary the force exerted thereby against the portions of the cylinder, the ports and grooves in conjunction with the various bearing casings being arranged in staggered relation to distribute the load, and

7 height.

In testimony whereof I aflix my signaturein presence of two witnesses.

WILLIAM (J. NASH.

Witnesses:

' C. L. J OURDAIN,

FRED SCI-IREIBER. 

